Disposable manifold with atmospheric vent

ABSTRACT

A manifold is formed with a plurality of ports for connection to various components such as arterial-venous pressure generators, a syringe, and a source of fluid and pressure sensitive transducers. The manifold includes one or more rotary members which are selectively positioned for interconnecting selected ones of the components. Various sampling, flushing and pressure measuring operations may be performed by use of the manifold. The manifold further includes a venting port arrangement for venting the pressure sensitive transducers to the atmosphere when a pressure measurement is not being taken. This protects the transducer from overpressurization and consequential damage.

United States Patent [191 Turney DISPOSABLE MANIFOLD WITH ATMOSPHERIC VENT [76] Inventor: Stephen Z. Turney, 320 Morris Ave., Lutherville, Md. 21093 [22] Filed: Jan. 12, 1973 [21] Appl. No.: 323,272

128/2.05 R, 214 R, 221, 274; l37/625.41, 625.42, 625.47, 625.24, 625.16, 625.15, 625.19; 251/181, 309, 310, 184, 297; 73/388 R, 398, 392.4, 389

[56] References Cited UNITED STATES PATENTS 717,899 1/1903 McDonald 137/625.47 X 1,854,307 4/1932 Hapgood l37/625.19 2,409,435 10/1946 Ketay et a1 73/388 R 2,485,842 10/1949 Pennington 128/214 R 2,600,324 6/1952 Rappaport 73/388 R 2,960,086 11/1960 Keller 137/625.47 X 3,157,201 11/1964 Littmann 128/2.05 D 3,526,136 9/1970 Caldwell, Sr. et a1. 251/309 X Sept. 10, 1974 3,526,218 9/1970 Reiss l28/2.05 D 3,610,228 10/1971 Temkin 128/2.05 D

FOREIGN PATENTS OR APPLICATIONS 560,788 4/1957 ltaly 137/625.47 1,116,997 6/1968 Great Britain 128/2.05 D

Primary Examiner--Richard A. Gaudet Assistant Examiner-J. C. McGowan Attorney, Agent, or Firm-Walter G. Finch, Esq.

[57] ABSTRACT A manifold is formed with a plurality of ports for connection to various components such as arterial-venous pressure generators, a syringe, and a source of fluid and pressure sensitive transducers. The manifold includes one or more rotary members which are selectively positioned for interconnecting selected ones of the components. Various sampling, flushing and pressure measuring operations may be performed by use of the manifold. The manifold further includes a venting port arrangement for venting the pressure sensitive transducers to the atmosphere when a pressure measurement is not being taken. This protects the transducer from overpressurization and consequential damage.

14 Claims, 10 Drawing Figures PATENIED SEP 1 0 I974 PRESSURE GENERATOR EQUIVALENT TO ARTERIAL BLOOD PRESSURE i 36 SAL/NE SOURCE /0 32 l2 f: u

1 22 I T //I 1W H \v l6 SYR/NGE L 20 38 BRIDGE CIRCUIT 42 AND AMPLIFIER CE TRANSDL2J8 R FOR PRESSURE TRANSDUCER FIG. 2

Pmmaabswm 8m 2w 3.834.372

' HANDLE POSITION HYDRAULIC C/RCU/T FUNCTION /4 PRESSURE GENERATOR 34 ,0

1 MEASURE TRANSDUCER 28 PRESSURE GENERATOR 34 W/THDRAW E SYR/NGE FLUSH 2 BALANCE TRANSDUCER 28 SAL/NE L SYR/NGE PRESSURE GENERATOR 34 I 4 f FAsT FLUSH WITHOUT SAL/N5 SYR/NGE /80 PRESSURE GENERATOR 34 MEASURE TRANSDUCER 28 FIG. 3

PAIENIEDsmmsn M a 5 3.834372 44 2 a i 46 4a 50 54 FIG. 5

T0 T0 T0 44 ARTERY SYR/NGE vs/zv 90 ROTATION? 56' l T0 BLOOD TO TRANSDUCER SAMPLING TRANSDUCER FIG. 6

PATENIED W974 saw u a 5 3.834.372

\I FLUIDW PATIENT [TRANS- DUCER SAMPLE O READ O O FILL FLUSH/ SYRINGE' IOO VENT FIG. 7

.II .III

FIG. 8

FIG. 9

PAIENIEH SE? 1 01914 SHEET 5 Bf 5 Sw/TCH HYDRAULIC PDS/T/DN C/RCU/T FU/VC T/O/V TRANSDUCER PAT/ENT FLU/D READ TRANSDUCER vENT l READ O O 1vv F/LL FLUSH/ PAT/5N7 SAMPLE SYR/NCE TRANSDUCER PAT/ENT FLU/D F/LL T f SYRiNGE v FLU/D O R O vENT EAD IV R O O TRANSDUCER FILL FLUSH/ SAMPLE i SYR/NCE VENT TRANSDUCER PAT/ENT FLU/D 9 SYR/NGE PAT/ENT FILL FLUSH/ TRANSDUCER SAMPLE i SYR/NCE VENT TRANSDUCER PAT/ENT FLU/D IV FLU/D PAT/ENT READ [V O O TRANSDUCER F/LL FLUSH/ i SAMPLE SYR/NGE vENT FIG. 10

DISPOSABLE MANIFOLD WITH ATMOSPHERIC VENT This invention relates to protective manifolds, and more particularly to a manifold used with pressure sensitive transducers in the measurement of a system under pressure and with related sampling and flushing components.

There is a constant need for the measurement of pressure existing within a system such as, for example, an arterial blood system of a human being. This can be accomplished by connecting the pressure system to a pressure sensitive transducer which develops a readable measurement. In blood pressure measuring systems using this principle, a manifold is frequently employed to permit the further sampling of blood through the pressure line connected to the artery of the patient and, further, to permit flushing of the pressure line to insure removal of coagulated blood and other undesirable substances.

In use of available manifolds for this multiple purpose, the transducers are subjected to continuous pressurization during the sampling and flushing operations. This could be caused by an external flushing source which is constantly flushing a fluid through the transducer as a necessity for operation of the transducer. Or it could also be caused by having the sampling or flushing lines turned into the transducer during periods when sampling or flushing operations are in progress.

Regardless of the reason or manner in which the transducer is continuously pressurized, overpressurization frequentlyoccurs in the transducer which is seriously damaged as a result thereof. Needless to say the time and cost of repairing the damaged transducer results in an expensive maintenance program and requires additional inventory to insure the availability of working transducers when needed. In many instances such damaged transducers are irrepairable. Thus, there is a need fora manifold which will permit selective pressure measurement and further sampling and flushing operations of a fluid-pressure system, such as the arterial blood system of a human being, without overpressurizing the transducer at anytime during the various operations.

The manifold usually includes some form of valving arrangement to permit the conditioning of the manifold for the various sampling, flushing and measurement operations. It is critically important, especially in medical applications of the manifold, that some means be used to provide external indication of the .particular positioning of the valve arrangement. This will insure safety in the various operations.

Additionally, some means should be provided for insuring that the various components be connected to proper ports of the manifold. Otherwise improper connections between components can result with potentially serious consequences.

As noted previously, in one medical application of such a system,blood can be drawn from the patientin the sampling operation by use of the pressure line and certain portions of the manifold. Generally, this results in the collection of coagulated blood in thepressure line and manifold and causes a reduction in pressure during subsequent pressure-measuring operations.

In order to overcome this deficiency, there is a need for a flushing system which permits selective flushing of the portions to be cleaned without subjecting the pressure sensitive transducer to any pressurized fluids during the flushing period.

It is an object of this invention, therefore, to provide a manifold which will permit selective utilization of a pressure sensitive transducer and sampling and flushing facilities without overpressurization of the transducer.

conducted through the manifold exclusive of the transducer.

Other objects and attendant advantages of this invention will become more readily apparent and understood from the following detailed specification and accompanying drawings in which:

FIG. 1 is a perspective view of a complete multiport manifold assembly embodying certain principles of the invention;

FIG. 2 is a block diagram showing the manifold of FIG. 1 assembled in a typical application;

FIG. .3 is a chart-schematic diagram showing five positions of a rotary valve-member of the manifold of FIG. 1 and the function thereof .at each position; I

FIG. 4 is a plan view of three-valve, multiport manifold further embodying certain principles of the invention;

FIG. 5 is a side view of the manifold of FIG. 4 with a section cut away to show an overflow vent arrangement;

FIG. 6 is a schematic diagram showing the threevalve manifold of FIGS. 4 and 5 and the various selectively available positions for the valves;

FIG. 7 is a plan view of a sophisticated, singlevalve, multiport manifold embodying still further principles of the invention;

FIG. 8 is a side view of the manifold of FIG. 7;

FIG. 9 is a sectional view taken along line 99 of FIG. 8 showing details of the manifold of FIGS. 7 and 8; and

FIG. 10 is a chart-schematic diagram showing four positions of a rotary valve member of the manifold of FIGS. 7, 8 and 9 and the function thereof at each-position.

Referring to FIG. 1,'there is shown a protective manifold 10 composed of a plastic material and embodying certain principles of the invention. The manifold 10 includes a control handle 12 which controls the position of a rotary valve member formed integrally with the handle. A handle-position-indicator dial 14 is located adjacent to the handle 12 and cooperates with the handle, which also functions as a pointer, to identify a number of selectable handle positionsQThe-rotary valve member is formed with an opening 16 at one end thereof which facilitates atmospheric venting of a selected-port of themanifold IOIFurther, numbers on the dial 14 indicate functional positioning of the rotary valve member. A plurality of stems are formed integrally with and extend radially from a central, hollowhub housing having an opening which contains the rotary valve member. Two of the stems form a syringe port 18 and a transducer port 20.

As further illustrated in FIG. 2, additional'stems form a saline or flushing fluid port 22 and a pressure port 24. The manifold is arranged and connected so that a syringe 26 is connected to the syringe port 18. A pressure-responsive transducer 28 is connected to the port 20. The transducer 28 controls a bridge circuit and amplifier 30 to provide a readable measurement of pressure being analyzed. A saline source 32 which may be used for a flushing fluid, is connected to the port 22 and a pressure generator 34 is connected to the port 24. Feed lines 36, 38 and 40 are used to facilitate the above-mentioned connections Conductors 42 are used to connect the transducer 28 to the bridge circuit and amplifier 30.

The illustrated syringe 26 is a typical type of hydraulic syringe. However, other types of facilities could be used. For example, a bag, capable of containing a fluid, could be connected to the port 18 and squeezed and manipulated by hand to provide the necessary pressure reaction which is commonly accomplished by the syringe 26. y

The transducer 28, as illustrated, is a dome type which has a flushing fluid (not shown) being constantly flushed therethrough from an external source (not shown) to prevent damping of a pressure wave form being coupled to the transducer through the manifold 10. However, other types of transducers could be utilized. Or direct-reading, pressure-responsive devices such as mercury-filled manometers can be used.

The pressure generator 34 is equivalent to arterial blood pressure of a patient. The feed line 36 could be connected to a catheter, or similar device, for direct insertion into various areas of a patient to measure arterial, venous, cerebral, spinal fluid, gastrointestinal tract and lung pressures.

In use, the handle 12 is manipulated to position the rotary valve member within the hub housing so that channels formed internally of the rotary valve member provide an open passageway between selected ports within the manifold 10. This will permit, for example, connecting of the pressure generator 34 with the transducer 28. The generator 34 can be connected to the syringe 26 for withdrawal of blood samples. The syringe 26 can be connected to the saline source 32 for the withdrawal of flushing fluid into the syringe for subsequent. injection of the fluid into the feed line 36 for cleaning coagulated blood therefrom. An intravenously injectable fluid can replace the saline source 32 and the rotary valve member then positioned to permit direct infusion of the fluid through the manifold 10 into the patient.

The stems of the ports 18, 20, 22 and 24 can be of different structure or geometry to indicate which ports are to be connected to the various components such as the syringe 26, transducer 28, salinesource 32 and generator 34, respectively. Further, the stems could be color coded for the same purpose.

Referring to FIG. 3, the chart-schematic diagram is divided into three columns and five rows. The first column illustrates the position of the handle 12, and con-. sequently the position of the rotary valve member.

The second column shows the hydraulic circuit of the manifold 10, including the position of the rotary valve member and its internal passageway alignment. The third column shows the function of the manifold 10 in the various positions of the rotary valve member.

When the handle is in position 1, the passageway of the rotary valve member of the manifold 10 connects the pressure generator 34 to the transducer 28 with the resultant function being to measure the pressure. Notice that all remaining ports are closed by virtue of the selective positioningof the rotary valve member.

In position 2 of the handle, the pressure generator 34 is connected to the syringe 26. This permits the withdrawal of fluid, such as blood, from the patient by withdrawing the plunger of the syringe 26. This provides patient specimens for analyzation. It should be noted that blood will probably coagulate in the line 36 and passageway of the rotary valve member. This could cause a loss of pressure in later pressure-measuring operations.

After the syringe 26 containing the sampling of blood is removed, another syringe can be connected to the port 18 and the handle 12 moved to position 3. This connects the syringe 26 with the saline source 32 whereafter the saline solution can be withdrawn into the syringe to perform the function of filling the syringe with flushing fluid. The handle 12 is moved to position 2 where manipulation of the syringe plunger injects the flushing fluid through and cleans the passageway of the rotary member and thereby removes the coagulated blood.

It is particularly significant to note that while the handle 12 is in position 2, the transducer 28 is vented through the manifold 10 by the vent port 16 formed centrally in one end of the rotary valve member. This venting, when flushing or sampling withdrawal operations are occurring, protects the transducer 28 from overpressurization and consequential damage. The pressure in the transducer 28 is developed by the high pressure flushing of a fluid through the dome of the transducer for the previously mentioned damping purpose. The venting of the transducer 28 precludes the build-up of pressure beyond an acceptable threshold within the transducer and thereby prevents damage and irrepairable destruction of the transducer.

When the handle is placed in position 4, the passageway of the rotary valve member connects the pressure generator 34 and the saline source 32 for direct fast flushing of the passageway and feed line 36. Additionally, the saline source 32 could be replaced by a fluid which is to be fed directly into the patient.

The handle 12 can be placed in position 5, for a full position swing, to accomplish the same function as is accomplished in position 1.

In another embodiment of the invention, a threevalve, multiport, plastic manifold 44 is illustrated in FIG. 4. The manifold 44 includes three knobs 46, 48 and 50 which are integrally formed with rotary valve members as illustrated by knob 50 and its related valve member in FIG. 5. The knobs 46 and 50 are formed with vent ports 52 and 54, respectively. A series of stems extend laterally from opposite sides of a longitudinal housing of the manifold 44 and form ports 56, 58, 60, 62, 64 and 66.

The longitudinal housing of the manifold 44 is formed internally with passageways which extend between and communicate with openings formed in the housing. The openings receive and contain the rotary valve members which are also formed internally with passageways which are alignable with the passageways of the longitudinal housing. Locking caps 68 (FIG. 5) are positioned over and locked on the exposed bottom portions of the rotary valve members to secure for rotation the knobs 46, 48 and 50 and related rotary valve members with the longitudinal housing.

As further illustrated in FIG. 4, the knobs 46, 48 and 50 are formed on the face thereof with position indicators or pointers 70, 72 and 74, respectively, and passageway indicators 76, 78 and 80, respectively. The three valve assemblies which include the knobs 46, 48 and 50 are designated 82, 84 and 86 respectively.

The knob-visible face of the longitudinal housing are provided with label points about the periphery of the knobs 46, 48 and 50 which can be read in cooperation with the position indicators 70, 72 and 74 to indicate the functional positions of the particular valve assemblies 82, 84 and 86. To further facilitate the determination of functional positioning of the valve assemblies 82, 84 and 86, each label point has a literal label placed adjacent thereto such as READ, FLUSH, FILL, SAMPLE or ZERO. Although these labels would appear in the face of the longitudinal housing, they are illustrated away from the face for clarity purposes only.

The longitudinal housing is formed with spaced notches on opposite sides of longitudinal edges thereof to facilitate the secure mounting of the manifold 44 to an attaching structure. This keeps the assemblies 82, 84 and 86 from being vibrated, or from altering their positions due to vibrations, with reference pressure being measured.

'As illustrated in FIG. 6, the use of the manifold 44 permits the assembly of two transducers and two pressure generating systems (artery and vein) thereto. Also the assemblies 82 and 86 have a 90 rotation limit while the assembly 84 is rotatable through a full 360.

As shown, the assemblies 82 and 84 are positioned to connect an artery line to a syringe for flushing purposes while the assembly 86 is positioned to permit the measurement of venous pressure through a transducer. It is noted that the transducer which is connected to the port 56 is vented through the vent port 52 for protective precluding of overpressurization as previously explained while the flushing operation is in progress. By selective positioning of the valve assemblies 82, 84 and 86, various combinations of sampling, flushing and pressure measurement operations can be conducted. In any case, the transducers will always be vented when not being used for pressure measurement.

As illustrated in FIG. 7, a single valve multiport, plastic manifold 88, embodying certain principles of the invention, includes a knob 90 which is formed integrally with a rotary valve member 112 (FIG. 9). The rotary valve member 112 is positioned within a central opening of a manifold housing. Three stems form ports 92, 94 and 96 and extend from a rear face of the manifold housing. The ports 92, 94 and 96 are to be connected to a transducer, a patient and a fluid source, respectively, as labeled on the top face of the housing. Another stem forms a port 98 and extends from a front face of the housing. The port 98 is to be connected to a syringe as labeled on the top face of the housing. Still another stem forms a port 100 and extends from a side face of the housing and is normally open to the atmoselectively communicate with precisely formed passageways 104 and 106 in the rotary valve member 1 12.

Referring to FIG. 7, openings 108 are formed in the housing of the manifold 88 to facilitate securing of the manifold to an attaching structure which could be a fixed frame or the patient.

As shown in FIG. 8, a locking cap 1 10 is secured over the lower exposed end of the rotary valvemember 112 to secure for rotation the member to the housing.

It is also noted that the syringe port 98 extends from the front face of the manifold 88 and thereby permits ready access to the port for the only component, the syringe, which may be frequently worked, or exchanged, during performance of the various operations associated with other components attached to the manifold. The remaining ports 92, 94, 9 6 and are located on the rear or side faces to avoid confusion and danger of introducing wrong substances into the patient.

Referring to FIG. 10, the chart-schematic diagram is displayed in the same column and row arrangement as the diagram of FIG. 3.

When the pointer 102 is on the READ position, the rotary valve member 112 is positioned so that the transducer and patient are connected so that the pressure being sensed can be read. As noted previously this could be other pressure areas of the body other than that associated with the blood.

With the pointer 102 on the FILL position, the syringe is connected to the fluid source to permit the withdrawal of fluid into the syringe for subsequent flushing operation. It is important to note that the transducer is vented during this FILL operation.

As the pointer 102 is placed on the FLUSH/SAM- PLE" position, the syringe and the patient are connected to permit a line and manifold flushing operation or a blood or other patient substance sampling operation. It is further noted that the transducer continues to be vented during the FLUSH/SAMPLE operation.

The pointer 102 can also be moved to the IV position, which stands for intravenous position, wherein the fluid source is connected to the patient. If the fluid is a flushing fluid, it can be fed directly and quickly to the manifold 88 and the associated patient line for flushing foreign substances such as coagulated blood. It could also be used to infuse continuously intravenously various solutions used in the treatment of patients. Again, the transducer is vented during the IV operation.

Thus the transducer is vented for protection against overpressurization during each operation in which the transducer is not being used when the manifold 88 is utilized.

Further, the vent port 100 can be used to fill the dome of the transducer with fluid for damping purposes, which has been previously mentioned. This can be accomplished at any position except the READ position by connecting a syringe to the vent port' 100 and injecting fluid from the syringe into the dome.

The stems of the manifolds 44 and 88 could also be formed of different structure or geometry, or be color coded, to identify the functional purpose thereof rather than have the'labels on the face of the respective housmgs.

It is also possible to control the movement of the various rotary valve members of the various embodiments of manifolds 10, 44 and 88 by use of an external con trolling device (not shown). For example, the rotary valve member can be physically connected to an electrical control system which automatically rotates the valve member in response to electrical signals. The electrical control system could be operated selectively by a program or by a sequential timing circuit. Further, the valve member could be a sliding member rather than rotary. Or it could be both sliding and rotary and thereby movable to different levels of port-connecting facilities to expand the capabilities of the manifold.

The valve member could be formed of a structure which is controlled by an external device (not shown) to alter the arrangement of the internal passageways by a variety of means such as by rotation or sliding movement. For example, the valve member could include a pair of elements rotatable relative to each other with a combined internal passageway configuration when two elements are in one relation and another configuration when the elements are rotated relative to each other to a second relation. The two elements of the valve member would be rotated together when used in the manifold for the functions previously described and rotated relative to each other when it is desired to change the particular passageway relation for use in additional functions with the manifold. The same principle could be accomplished if the pair of elements were slidable, rather than rotatable, relative to each other.

The manifolds 10, 44 and 88 are sufficiently small, lightweight and inexpensive so that they may be presterilized and packaged in a protective, sealed wrapping until they are to be assembled with the various components for use. After use, they may be discarded or easily dismantled for cleaning, resterilization and reuse. Removal of the locking cap, such as caps 68 and 110, permit dismantling.

While the particularly described embodiments of manifolds 10, 44 and 88 have referred to applications in the medical field, the use of these manifolds can be widespread. For example, manifolds of this type can be used wherever there is a need to measure pressures and transfer liquids or gases. This could be in experimental endeavors or in an actual manufacturing environment. It is to be further understood that the use of the term fluid herein refers to liquid as well as gas.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

l. A protection manifold, which-comprises, means having internal passageways and associated external ports for connecting various components thereto to permit the transfer therethrough of fluids wherein at least some of said fluids are pressurized, means mounted movable and partially within and relative to said connecting means for controlling the selective connection of at least a pair of said connecting-means passageways to connect the various components connected to the external ports of the pair of passageways, and means formed in said controlling means independently of said connecting means for venting to' the atmosphere a selected one of said connecting-means passageways during a period when at least two other passageways are selectively connected by said controlling means to vent the component connected to the sclected one of said passageways.

2. A protection manifold as recited in claim I, which 4. A protection manifold as recited in claim 1 wherein said controlling means includes, a movable valve member positioned within an opening of said connecting means, said member formed with passageways in a selected pattern so that when said valve member is selectively positioned selected passageways of said connecting means are connected through the passageways of said member.

5. A protection manifold as recited in claim 4 wherein said venting means includes, a selectively formed passageway in said movable valve member which is aligned with a selected one of said ports for the selective venting of the component connected thereto.

6. A protection manifold as recited in claim 2, wherein said indicating means includes, pointer means formed with said movably mounted controlling means, and labels placed selectively in fixed locations on said connecting means adjacent to positions at which said pointer is positionable.

7. A protection manifold as recited in claim 1, wherein said connecting, controlling and venting means are formed of plastic.

8. A protection manifold as recited in claim 4 wherein said movable member is rotatable relative to said connecting means to effect the selective positioning thereof.

9. A protection manifold as recited in claim 4, wherein said movable member is slidable relative to said connecting means-to effect the selective positioning thereof. YiiMM'MWW'MTMMV 10. A protection manifold as recited in claim 1,

opening and each of said side openings, and a pair of ports communicating with each opening;

said controlling means includes, three movable valve members being assembled within the three openings of said housing, and each of said valve members being formed with passageways which selectively connect the housing passageways and ports; and 1 said venting means includes a passageway formed in each of at least two of the three valve members to selectively provide a venting passageway for at least two of said ports and components connected thereto. 13. A protection manifold as recited in claim 1 wherein said ports are provided for connecting to a syringe, a pressure sensitive transducer, a fluid source and selected areas of a patient, said controlling means is selectively manipulatable relative to said connecting means to selectively connect the syringe with the fluid source or the patient areas for flushing and sampling operations, and to selectively connect the patient areas to the transducer for pressure measurement, and said venting means is connected protectively to the transducer when the syringe is connected to the fluid source or the patient.

14. A protection manifold as recited in claim 1, which further comprises means physically connected to said controlling means for operating and controlling means to selected positions. 

1. A protection manifold, which comprises, means having internal passageways and associated external ports for connecting various components thereto to permit the transfer therethrough of fluids wherein at least some of said fluids are pressurized, means mounted movable and partially within and relative to said connecting means for controlling the selective connection of at least a pair of said connecting-means passageways to connect the various components connected to the external ports of the pair of passageways, and means formed in said controlling means independently of said connecting means for venting to the atmosphere a selected one of said connecting-means passageways during a period when at least two other passageways are selectively connected by said controlling means to vent the component connected to the selected one of said passageways.
 2. A protection manifold as recited in claim 1, which further comprises, means appearing partially and externally on each of said connecting and controlling means for indicating the selective positioning of said controlling means.
 3. A protection manifold as recited in claim 1, wherein said connecting means includes, a housing, at least one opening formed in said housing, a plurality of hollow stems extending from said housing and forming ports, and said ports forming a plurality of passageways in said housing with at least one passageway extending from said opening to an exterior face of said housing.
 4. A protection manifold as recited in claim 1 wherein said controlling means includes, a movable valve member positioned within an opening of said connecting means, said member formed with passageways in a selected pattern so that when said valve member is selectively positioned selected passageways of said connecting means are connected through the passageways of said member.
 5. A protection manifold as recited in claim 4 wherein said venting means includes, a selectively formed passageway in said movable valve member which is aligned with a selected one of said ports for the selective venting of the component connected thereto.
 6. A protection manifold as recited in claim 2, wherein said indicating means includes, pointer means formed with said movably mounted controlling means, and labels placed selectively in fixed locations on said connecting means adjacent to positions at which said pointer is positionable.
 7. A protection manifold as recited in claim 1, wherein said connecting, controlling and venting means are formed of plastic.
 8. A protection manifold as recited in claim 4 wherein said movable member is rotatable relative to said connecting means to effect the selective positioning thereof.
 9. A protection manifold as recited in claim 4, wherein said movable member is slidable relative to said connecting means to effect the selective positioning thereof.
 10. A protection manifold as recited in claim 1, which further comprises, means formed in said connecting means for securing the manifold to An attaching structure.
 11. A protection manifold as recited in claim 3 wherein each of said stems are formed of a different geometry to indicate the function of the component to be connected thereto.
 12. A protection manifold as recited in claim 1 wherein said connecting means includes, a housing, a central and two side openings formed in one face thereof, a passageway extending between said central opening and each of said side openings, and a pair of ports communicating with each opening; said controlling means includes, three movable valve members being assembled within the three openings of said housing, and each of said valve members being formed with passageways which selectively connect the housing passageways and ports; and said venting means includes a passageway formed in each of at least two of the three valve members to selectively provide a venting passageway for at least two of said ports and components connected thereto.
 13. A protection manifold as recited in claim 1 wherein said ports are provided for connecting to a syringe, a pressure sensitive transducer, a fluid source and selected areas of a patient, said controlling means is selectively manipulatable relative to said connecting means to selectively connect the syringe with the fluid source or the patient areas for flushing and sampling operations, and to selectively connect the patient areas to the transducer for pressure measurement, and said venting means is connected protectively to the transducer when the syringe is connected to the fluid source or the patient.
 14. A protection manifold as recited in claim 1, which further comprises means physically connected to said controlling means for operating and controlling means to selected positions. 